For My Sister, I Became a Magical Girl

[New author, if there are any shortcomings, please point them out and I will definitely correct them! Sliding and kneeling On that summer night when she was twelve years old, Bai Jin hid in the closet holding her young sister and witnessed the death of her parents. And the magical girl who is regarded as a hero by the world has never been here from beginning to end. ——They are children abandoned by magical girls. Four years later, Bai Jin began to work for a living as a non-staff researcher at the Magic Countermeasures Bureau. Everything was so ordinary. Until one day, a new magical girl appeared in their city, which was not loved by magical girls. Bai Jin didn't pay much attention at first, until he discovered a surprising fact. That magical girl—is actually his sister? ! "Sign a contract with me and become a magical girl!" It happened that at this moment, a contract appeared in front of him. There was no choice but to become a magical girl for the sake of her sister.